Add SRV records docs

docs/dns-srv-records.md

@@ -0,0 +1,51 @@
+# DNS SRV Records
+
+By default confd will try and connect to etcd at `http://127.0.0.1:4001`. To connect to a different set of etcd nodes you can use the `-node` flag on the command line:
+
+```Bash
+confd -node http://etcd0.example.com:4001 -node http://etcd1.example.com:4001
+```
+
+Or via the `etcd_nodes` configuration option in the confd configuration file, i.e. `/etc/confd/confd.toml`.
+
+```TOML
+etcd_nodes = [
+  "http://etcd0.example.com:4001",
+  "http://etcd1.example.com:4001",
+]
+```
+
+As of confd version 0.2.0 you can specify a DNS domain name to query for etcd SRV records via the `-srv-domain` flag. Assuming the following SRV records exist:
+
+```Bash
+ dig SRV _etcd._tcp.confd.io
+```
+
+```Bash
+... 
+;; ANSWER SECTION:
+_etcd._tcp.confd.io.  300 IN  SRV 1 50 4001 etcd0.confd.io.
+_etcd._tcp.confd.io.  300 IN  SRV 2 50 4001 etcd1.confd.io.
+```
+
+```Bash
+confd -onetime -verbose -srv-domain confd.io
+```
+
+Output
+```Bash
+2013-11-03T19:04:53-08:00 confd[21356]: INFO SRV domain set to confd.io
+2013-11-03T19:04:53-08:00 confd[21356]: NOTICE Starting confd
+2013-11-03T19:04:53-08:00 confd[21356]: NOTICE etcd nodes set to http://etcd0.confd.io:4001, http://etcd1.confd.io:4001
+2013-11-03T19:04:54-08:00 confd[21356]: INFO /tmp/myconf2.conf has md5sum ae5c061f41de8895b6ef70803de9a455 should be 50d4ce679e1cf13e10cd9de90d258996
+2013-11-03T19:04:54-08:00 confd[21356]: INFO Target config /tmp/myconf2.conf out of sync
+2013-11-03T19:04:54-08:00 confd[21356]: INFO Target config /tmp/myconf2.conf has been updated 
+```
+
+By default the `etcd-scheme` will be set to http. If you would like to use https instead use the `-etcd-scheme` flag
+
+```Bash
+confd -onetime -verbose -srv-domain confd.io -etcd-scheme https
+```
+
+Both the SRV domain and etcd scheme can be configured in the confd configuration file. See the [Configuration Guide](https://github.com/kelseyhightower/confd/wiki/Configuration-Guide) for more details.